REFRACTORY DIVERTICULAR COLITIS WITH PROGRESSIVE ULCERATIVE COLITIS‐LIKE CHANGES EXTENDING TO THE RECTUM

A 68‐year‐old man visited our department because of diarrhea and bloody stools. Colonoscopy revealed diverticula scattered in the sigmoid colon with localized mucosal edema and reddening. The mucosa became somewhat rough 9 months later, and had an erosive, ulcerative colitis (UC)‐like appearance after a further 6 months, with these changes extending to the rectum. These findings led to a diagnosis of diverticular colitis (DC) with UC‐like changes. The condition was refractory to treatment including drug therapy and was thus surgically treated. No cases of DC have been reported in Japan, and a refractory case of DC with progressive UC‐like changes extending to the rectum is rare even in Europe and the USA.